<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>HslColor</title>
    <link rel="stylesheet" href="../css/style.css">
    <script type="text/javascript" src="../../dist/paper-full.js"></script>
    <script type="text/paperscript" canvas="canvas">
        var steps = {
            hue: 100,
            saturation: 20,
            lightness: 3
        };

        for (var i = 0; i < steps.lightness; i++) {
            var radius = view.size.width / steps.lightness * 0.45;
            var offset = new Point(view.size.width / steps.lightness, 0);
            var position = view.bounds.leftCenter + offset * (i + 0.5);
            var lightness = 1 - (i + 1) / (steps.lightness + 1);
            createWheel(position, radius, steps, lightness);
        };

        function createWheel(center, radius, steps, lightness) {
            var hUnit = 360 / steps.hue;
            for (var h = 0; h < steps.hue; h++) {
                var hue = h * hUnit;
                var vector = new Point({
                    angle: hue - 90,
                    length: radius
                });
                path = new Path(new Point(), vector.rotate(hUnit / 2));
                path.closed = true;
                path.arcTo(vector, vector.rotate(hUnit / -2));
                path.position += center;
                var colors = [];
                for (var i = 0; i < steps.saturation; i++) {
                    var saturation = i / steps.saturation;
                    var color = { hue: hue, saturation: saturation, lightness: lightness };
                    colors.push(color);
                }
                var gradient = new Gradient(colors, true);
                var from = center;
                var to = center + vector;
                var gradientColor = new Color(gradient, from, to);
                path.fillColor = path.strokeColor = gradientColor;
            }
        }
    </script>
</head>
<body>
    <canvas id="canvas" resize style="background:black"></canvas>
</body>
</html>
